Fira (typeface)
Fira Sans is a humanist sans-serif typeface designed by Erik Spiekermann, Ralph du Carrois, Anja Meiners, Botio Nikoltchev of Carrois Type Design, and Patryk Adamczyk of Mozilla Corporation. The typeface was originally commissioned by Telefónica and Mozilla Corporation as part of the joint effort during the development of Firefox OS. It is a slightly wider and calmer adaptation of Spiekermann's typeface Meta, which was used as Mozilla's brand typeface at the time, but optimized for legibility on (small) screens.